Final answer:
The intrinsic pathway is initiated by exposure of collagen. It is longer and more complex, and involves factors that are intrinsic to the bloodstream. This pathway leads to the formation of a blood clot.
Step-by-step explanation:
The coagulation pathway that is initiated by exposure of collagen is the intrinsic pathway. This pathway is longer and more complex, and the factors involved are intrinsic to the bloodstream. When collagen is exposed due to internal damage to the vessel wall, it triggers the activation of factor XII, which then sets off a series of reactions leading to the activation of factor X and ultimately the formation of a blood clot.